XML 43 R77.htm IDEA: XBRL DOCUMENT v2.4.0.6
Pension and Postretirement Benefit Plans - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2012
Steelworkers Pension Trust
Minimum
Green Zone
Dec. 31, 2012
Steelworkers Pension Trust
Minimum
Yellow Zone
Dec. 31, 2012
Steelworkers Pension Trust
Maximum
Dec. 31, 2012
Steelworkers Pension Trust
Maximum
Red Zone
Dec. 31, 2012
Foreign Postretirement Benefit Plans, Defined Benefit
Jun. 30, 2011
Foreign Pension Plans, Defined Benefit
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit
Dec. 31, 2011
Foreign Pension Plans, Defined Benefit
Dec. 31, 2010
Foreign Pension Plans, Defined Benefit
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit
Growth Portfolio
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit
Immunizing Portfolio
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit
Liquidity Portfolio
Defined Benefit Plan Disclosure [Line Items]                              
Estimated net actuarial loss for the defined benefit pension plan             $ 0   $ 4     $ 21      
Prior service cost, plan amendment 6               6            
Reduction in pension benefit obligation               77 3 77 32        
Reduction in the fair value of plan assets               77 3 77 32        
Pension benefit obligations settlement loss               5   5 2        
Benefit obligations that are not required to be funded             132   256            
Defined benefit plan investment policy description   Investment policy - Target asset allocations of U.S. pension plans are established through an investment policy, which is updated periodically and reviewed by an Investment Committee, comprised of certain company officers and directors. The investment policy allows for a flexible asset allocation mix which is intended to provide appropriate diversification to lessen market volatility while assuming a reasonable level of economic risk.                          
Asset allocation                         50.00% 49.00% 1.00%
Asset target allocation                         48.00% 48.00% 4.00%
Expected rate of return                       7.00%      
Projected contributions to be made to the defined benefit pension plans                 $ 15     $ 40      
Fund percentage     80.00% 65.00%   65.00%                  
Percentage of contribution range         5.00%